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This CL checks CENC-v3 instead of CENC-v1. See Bug for more details.

Bug: 899984
Test: Tested manually.
Change-Id: I860ebae0657f76af91e7346524fdbb8b16f42f89
Reviewed-on: https://chromium-review.googlesource.com/c/1306635Reviewed-by: Rintaro Kuroiwa <rkuroiwa@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603690}